Re: [PATCH v3 2/9] Documentation: dt-bindings: Document STM32 pinctrl driver DT bindings
From: Rob Herring
Date: Fri Dec 11 2015 - 11:48:38 EST
On Wed, Dec 9, 2015 at 3:37 AM, Maxime Coquelin
> Hi Rob,
> 2015-12-09 4:41 GMT+01:00 Rob Herring <robh@xxxxxxxxxx>:
>> On Tue, Dec 08, 2015 at 01:45:04PM +0100, Maxime Coquelin wrote:
>>> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
>>> .../bindings/pinctrl/st,stm32-pinctrl.txt | 126 +++++++++++++++++++++
>>> 1 file changed, 126 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt
>>> diff --git a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt
>>> new file mode 100644
>>> index 0000000..7b4800c
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt
>>> @@ -0,0 +1,126 @@
>>> +* STM32 GPIO and Pin Mux/Config controller
>>> +STMicroelectronics's STM32 MCUs intregrate a GPIO and Pin mux/config hardware
>>> +controller. It controls the input/output settings on the available pins and
>>> +also provides ability to multiplex and configure the output of various on-chip
>>> +controllers onto these pads.
>>> +Pin controller node:
>>> +Required properies:
>>> + - compatible: value should be one of the following:
>>> + (a) "st,stm32f429-pinctrl"
>>> + - #address-cells: The value of this property must be 1
>>> + - #size-cells : The value of this property must be 1
>>> + - ranges : defines mapping between pin controller node (parent) to
>>> + gpio-bank node (children).
>>> + - pins-are-numbered: Specify the subnodes are using numbered pinmux to
>>> + specify pins.
>>> +GPIO controller/bank node:
>>> +Required properties:
>>> + - gpio-controller : Indicates this device is a GPIO controller
>>> + - #gpio-cells : Should be two.
>>> + The first cell is the pin number
>>> + The second one is the polarity:
>>> + - 0 for active high
>>> + - 1 for active low
>>> + - reg : The gpio address range, relative to the pinctrl range
>>> + - clocks : clock that drives this bank
>>> + - st,bank-name : Should be a name string for this bank as specified in
>>> + the datasheet
>> How do you intend to use this? We should come up with something generic
>> or drop it.
> Good point.
> It is used to have a meaningful name set in gpio_chip's label.
Who cares about the gpio_chip name?
> I see two alternatives:
> 1. replace "st,bank-name" with label
> 2. use aliases, and construct label in driver with something like:
> kasprintf(GFP_KERNEL, "GPIO%c", 'A' + of_alias_get_id(np, "gpio"));
> What do you prefer?
I prefer to not need it. Of these 2 though, probably using label.
However, I'm not convinced to say yes, we should use that because it
will only encourage others to do the same.
> Do you have other ideas?
We do need names on individual lines though. I'd rather not complicate
things by having labels for both unless we can define the need for it.
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